Henry a



(No Model.)

STOP WATCH. No. 505,052. Patented Sept. 12, 1893.

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0 M F W 2- 2 INVENTOR j mm ATTORNEYS.

UNITED STATES PATENT OFFICE.

HENRY A. LUGRIN, OF BROOKLYN, ASSIGNOR TO ALBERT VVITTNAUER, OF NEWYORK, N. Y.

STOP-WATCH SPECIFICATION forming part of Letters Patent No. 505,052,dated September 12, 1893.

Application filed April 11,1893. Serial No. 469,866. (No model.)

To all whom it may concern:

Be it known that I, HENRY A. LUGRIN, a citizen of the United States, anda resident of Brooklyn, in the county of Kings and State of New York,have invented certain new and useful Improvements --in Stop-Watches, ofwhich the following is a specification.

This invention relates to improvements in stop watches, and especiallyto that class of stop watches that are known as split seconds watches.l-Ieretofore considerable difficulty has been experienced inconstructing watches of this kind in such a manner that the center wheelof the watch remains at the center without interfering with a split ortiming mechanism, and various contrivances have been made to constructwatches of this kind with the center wheel at the center of the movementand thus avoid the complicated gearing that would otherwise be required.

The object of my invention is to provide a stop watch of this kind whichis simple in construction and which permits of readily taking the timingand split seconds mechanism out of the watch movement without disturbingthe other parts.

A further object of my invention is to provide means for preventing theroller on the end of the arm acting on the heart cam of the splitseconds mechanism from binding and catching.

The invention consists in the construction and combination of parts anddetails, which will be fully described hereinafter and finally pointedout in the claims.

In the accompanying drawings, Figure 1 is a transverse sectional view ofthat part of a watch movement provided with my improved split secondsmechanism. Fig. 2 is a see tional plan view, on the line 2 2, of Fig. 1,and Fig. 3 is a detail plan view on a smaller scale, of the split wheeland the cam for operating the split mechanism.

Similar letters of reference indicate correspondin g parts.

In the drawings, A represents a top plate or top bridge of a watchmovement, and on the same an additional bridge B is fastened, from whicha center post projects in the 50 direction toward the dial and throughthe same, said dial being shown in dotted lines in Fig. 1. The timingwheel D of the usual construction is provided with the tubular arbor D,which surrounds the center post 0, and on the front of said arbor thetiming hand D is fixed. The usual brake D for the timing wheel isprovided for the purpose of holding the same when the timing is not tooperate. The heart cam E of the timing mechanism wheel is fixed on thesame in the usual manner, and can be acted upon by the usual fly backlever E, which serves for throwing the timing hand back to 12. The heartcam F for the split seconds wheel is fastened to the timing wheel and tothe heart cam E of the timing wheel in the well known manner. The splitseconds wheel G is provided with the tubular arbor G which surrounds thetubular arbor D of the timing wheel and at the front end, said tubulararbor G carries the split seconds hand G On said split seconds Wheel thelever H is pivoted, said lever carrying a roller H that runs on the edgeof the split seconds heart cam F, as shown in Figs. 1 and 3.

The usual brake I is provided for locking the split seconds wheel, whichbrake is provided with a spur I, on which the teeth of a cam Wheel J actin the usual manner, said cam-wheel I being connected with a ratchetwheel K, which in turn is rotated by a pushbutton L, so as to st op andstart the split seconds wheel. The center wheel M of the watch isprovided with a tubular arbor M, which surrounds the tubular arbor G,and on said arbor M the arbor N of the wheel N is held friction tight,said arborN carrying the minute hand N The arbor O of the wheel 0carries the hour hand 0 said wheel 0 being driven from the wheel N bymeans of the cog-Wheel P and pinion P in the usual manner. R is theusual intermediate wheel that is adapted to engage the timing wheel D.As

appears clearly from Fig. 1, the arbor-s of the timing and split secondswheel pass freely through the center wheel of the watch and its arbor,without having any connection whatever with the same, and the entirechronograph mechanism is supported entirely on Y place. The entiretiming mechanism can thus be readily removed by detaching the bridge Band withdrawing the same and its post 0 with the timing and splitseconds wheel and their arbors. The split seconds wheel is locatedbetween the bridge B and the top plate or bridge A of the watchmovement, in contradistinction to watches which have the split wheelunder the dial at the extreme top-that is, the uppermost wheel on theback.

It frequently happens in split seconds watches that the small roller Hon the end of the lever H is on the point of the heart cam when thetiming hand is stopped, thus preventing the operation of the splitseconds device when released. To prevent this, the additional lever onis provided, which is provided with a spur m upon which the cams of thewheel J can act, and said lever m carries on its free end a spring 0,which bears against the rim of the split seconds wheel. At the same timethat the brake lever I is operated to release the split secondswheelthat is, moved out of contact with the same the lever on is movedby the action of the wheel J in the direction from the split secondswheel, and by frictional contact the spring arm 0 on the end of the armm rotates the split seconds wheel slightlythat is, sufficient to bringthe roller II 01f the end of the cam F and permit said roller by itsaction on the heart cam, to turn the split wheel in the proper manner.

The above described timing and split seconds mechanism can be applied onany construction of watch, providing that the bore and tubular arbor ofthe center wheel and the arbors for the minute and hour hands are madeof proper size. The timing mechanism does not interfere in any waywhatever with the parts of the watch movement.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a stop watch, the combination, with a bridge, of a stem or postprojecting from the same through the center wheel of the watch, a hollowarbor surrounding said post loosely, atiming wheel on one end, and ahand on the other end of said arbor, substantially as set forth.

2. In a stop watch, the combination, with a bridge and a post projectingfrom the same, of a hollow arbor surrounding said post, a timing wheelon one end of said arbor, a hand on the other end of said arbor, asecond hol- 10w arbor surrounding the first hollow arbor,

a split seconds hand wheel on one end of said second arbor and a splitseconds hand on the other end of said second hollow arbor, substantiallyas set forth.

3. In a stop watch, the combination, with a bridge, of a post projectingfrom the same, two concentric tubular arbors for the timing and splitseconds hands and for the timing and split seconds wheels, which arborspass through a tubular arbor of the center wheel of the watch, andtubular arbors for the hour and minute hands surrounding the tubulararbor of the center wheel of the watch, substantially as set forth.

4;. In a stop watch, the combination, with a top bridge or plate, of anadditional bridge on the same, a post projecting from said additionalbridge, two concentric tubular arbors on said post, a timing and splitseconds wheels, and timing and split seconds hands on said arbors, thetiming wheel and split seconds wheel being arranged between the topbridge or plate and the said additional bridge of the movement,substantially as set forth.

5. In a stop watch, the combination, with the split seconds wheel, of aheart cam and a spring arm on the splitseconds wheel, and an armprovided with a spring extension resting against the rim of the splitseconds wheel, substantially as set forth.

6. In a stop watch, the combination, with a timing wheel, and a splitseconds wheel, of a heart cam on the arbor of the timing wheel, a springlever on the split seconds wheel, the end of which rests on the rim ofthe heart cam, a brake-arm for the split seconds wheel, a cam wheelacting on the brakearm, an additional arm also acted upon by the camwheel, and a spring-extension on said additional arm, whichspring-extension bears on the rim of the split seconds wheel,substantially as set forth.

7. A split seconds watch having a special lever for turning the splitseconds wheel when released, substantially as set forth.

8. A split seconds watch having a special lever in contact with the rimof the split seconds wheel for the purpose of turning said wheel whenreleased, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

HENRY A. LUGRIN.

Witnesses:

OSCAR F. GUNZ, CHARLES SoHRoEnER.

